Exhaust clamps, where and why?

[Katfish]

My stainless steel exhaust tips arrived for my Challenger.  Couple of questions:

1) If using clamps, does the tip go inside or over the car's exhaust pipe?

2) Would it be better to just have it welded on?

[Chryco Psycho]

welding is an option , TTi uses a stainless band clamp & a small rivi tto keep the tip from rotating , the rivit is held in place by the band clamp